version_string.sh uses VERSION.txt if not in a Git repo

.gitignore

@@ -7,6 +7,7 @@
 *.a
 *.suo
 .*.sw?
+VERSION.txt
 configure
 autom4te.cache
 Makefile

Makefile.in

@@ -99,12 +99,14 @@ sqlite-amalgamation-3070900/sqlite3.o:	sqlite-amalgamation-3070900/sqlite3.c
 	@echo CC $<
 	@$(CC) $(CFLAGS) $(DEFS) -c $< -o sqlite-amalgamation-3070900/sqlite3.o
 
-version.o: *.h *.c version_string.sh COPYRIGHT.txt Makefile
+version.o: *.h *.c version_string.sh VERSION.txt COPYRIGHT.txt Makefile
 	@echo CC version_servald.c
 	@V=`./version_string.sh --ignore-untracked` \
 	 && C="`sed -e :a -e N -e '$$!ba' -e 's/[\\\\"]/\\\\&/g' -e 's/\\n/\\\\n/g' COPYRIGHT.txt`" \
 	 && $(CC) -c version_servald.c -o $@ -DSERVALD_VERSION="\"$$V\"" -DSERVALD_COPYRIGHT="\"$$C\""
 
+VERSION.txt:
+
 %.o:	%.c
 	@echo CC $<
 	@$(CC) $(CFLAGS) $(DEFS) -c $< -o $@

version_string.sh

@@ -99,8 +99,12 @@ esac
 cd "$repo_path" >/dev/null
 
 if [ ! -d .git ]; then
-  echo "UNKNOWN-VERSION"
-  exit 0
+   if [ -s VERSION.txt ] && [ $(cat VERSION.txt | wc -l) -eq 1 ]; then
+      cat VERSION.txt
+   else
+      echo "UNKNOWN-VERSION"
+   fi
+   exit 0
 fi
 
 get_author_label() {